Grinding-machine.



i.. F. IVICNLLY.

GRlNDING MACHINE,

APPLICATION HLED ma. 23. 19,15.

"'ilig, Param@ 0st. 23, 1917.

tno r. MCNALLY,

v BUFFALO, NEW YORK. y

GRINDING-MACHINE.

Specification of Letters Patent.

Patented Oct.23, 1917.

Application filed Eebruary 23, 1916. Serial No. 80,931.

To'aZZ 'whom t may cof/cem Y Be it known that I, Lno F. MCNALLY, a

citizen of the United States, residing at Salamanca, in the county oi Cattaraugus and State of New York, have invented new and useful improvementsy in Grinding-Machines, ot which the following is a specification. c

This invention relates more particularly to a machine for grinding. grain or other materials in which two relatively movable grinding members are employed, one of these members being rotatable and the other normally fixed and capable of adjustment toward and from the rotatable member for the purpose of adjusting thedegree of fineness to which the. material is to be ground and also for separating the grinding members so as to clear them of any obstruction and also permit of ready inspection and repairing. j j y.

ln such machines, as heretofore constructed, a feed chamber has usually'been employed by which the material to be ground was fed to the grinding members, this feed chamber being stationary andthe normally fixed grinding head being movable relatively j y two standards to the same. Y

ln such prior structures the adjusting device for the normally fixed grinding member was so located that the same was liable to be affected by moisture and dust from the material which was being ground and therefore rendered adjustment of the normally fixed grinding member diicult, and

the same was also arranged externally of.

the main frame of the machine to a large extent so that it was in the way of the attendant and also necessitated a somewhat complicated and expensive construction.

One of the kpurposes of this invention is to mount the normally iixed grinding member and the feeding chamber on the main frame so that they may be simultaneously adjusted toward and fromth'e rotatable grinding member, thereby permitting the employment of an adjustingmechanism for these parts which is notliable to be aiiected by the moisture or dust particles from vthe material which is being ground.

Another object oi' this invention is to provide an adjusting' device for the feed Achamber and the grinding membermounted thereon which is arranged principally within theframe of the machine where the same is 'concealed from view and not only produces a n neat and finishedy appearance of the machine but also renders the machine more compact, less liable to interfere with the free movement ci the operator about the machine and also enables this adjusting device to be cona vertical longitudinal section of the same.

l? ig. 8 is a vertical transverse section thereof taken on line 3 3, Figx. Fig. 4 is a cross section, on an enlarged scale, ony line Ll-n Fig. a. o

Similar characters of reference indicate corresponding parts throughout the several views.

The main frame of this machine may be of any suitable construction to properly sup'- portl the working parts, but as shown in the drawings the same comprises a base l and 2., 3 rising from the rear part of this base. f i

4, 5 represent two relatively `movable grinding members which are preferably constructed in the form yof circular heads or disks which are arranged axially side by side, the grinding head et being preferably mounted to rotaterabout a horizontal axis while the normally fixed grinding head 5 is arranged axially in line with the rotatable grinding head but is capable of axial adjustment toward and from the same. 0n their opposing faces these grinding heads are provided with grinding plates 6, 7 which are removably secured thereto by screws 8 or the like and which receive the material to be ground between them adjacent to the axis thereof so that this material in passing radially outward between the grinding plates is ground or reduced and escapes at the periphery of the grinding heads.

The rotatable grinding head 4 is mounted on a rhorizontal driving shaft 9 which is journaled lengthwise of the frame in bearings l0, ll arranged at the upper end of the standards and is turned by a driving belt passing around a pulley l2 mounted on this shaft between its bearings.

rEhe material to be ground is fed to the grinding plates adjacent to the axis of the grinding heads through a feed opening or passage llformed axially in the normally fixed grinding head. This material is supplied from a feeding chamber le which is mounted on the front end of the base and provided on the front Vpart of its upper side with an inlet l5 for the material to be ground and at its inner or rear end with an outlet 16 which registers with the feed passage of the normally fixed grinding head. rfhe material to be ground is directed into the` inlet of the feeding chamber by means of a hopper 17 secured to the top of the feeding chamber, as shown in the drawings, or byV any other suitable means. rEhe movement of the material from the feeding chamber through the outlet thereof and the central passage ofthe normally fixed grinding diskto the space between the grinding plates is preferably effected by means of a screw conveyer 18 which'is arranged horizontally and lengthwise within the feeding chamber and the grinding head 5 and mounted on a forward extension i9 of the driving shaft which is arranged in the feeding chamber.

The normally fixed grinding head is secured to the rear or inner end of the feeding chamber by means of screws 20, as shown or by other suitable means so that` this grinding head and the feeding chamber and the parts connected therewith are compelled to move inwardlyv and outwardly together in adjusting the normally fixed grinding head and its plates relative to the rotatable grinding head and its plates.

lflhile thus moving the normally fixed grinding headV and the feeding chamber in unison for varying the distance between the two sets of grinding plates no sliding joints are employed between the feeding chamber and the companion grinding head mounted thereon through which moisture and dust are liable to leak which otherwise would cause these parts to stick and render the adjustment of one grinding disk relatively to the other difficult and inconvenient.

The front or outer end of the feeding chamber is preferably provided with an opening which is normally closed by a removable head or wall Q1 which is secured thereto by means of screws 22, thereby permitting of convenient access to the interior of the feeding chamber for inspection and cleaning when this is necessary.

The feeding chamber may be slidably mounted on the main frame so that the same Laagste together with the parts connected therewith may be adjusted toward and from the rotatable grinding head. rlhis, however, is preferably accomplished by mounting the feed chamber on the upper side or top of carriage 23 which has its lower or underside constructed in the forni of a dove tail 24e which slides in a correspondingly shaped dove-tail guideway 25 on the upper front part of the base of the frame, as best shown in Fig. 3. Any looseness between the dove tail portion of this carriage and the guideway may be taken up by means of a filling piece 26 arranged between one of the iiil the outer side of this filling piece.

Although the means for adjusting the Vfeeding chamber and the parts mounted thereon lengthwise toward and from the rotatable grinding head may be varied those shown in the drawings have been found satisfactory in practice and are constructed follows:

2S represents a bracket depending from the under side of the feed chamber carriage into the front part of the base which is made hollow, said bracket being preferably formed separate from the feed chamber and secured thereto by any suitable means, vfor instance by meansV of screws 29, as shown in Figs. 2 and 3. ln its lower partv this bracket is provided with an openingBO which is threaded to receive the end of the adjusting rod 3l and is held from turning,

. with the bracket and hopper chamber. rfhe outer end of Vthis rod projects through the front end of the base and is provided with anV external thread and a keyway on the bottom side of the rod. 33 represents an adjusting bushing whichfreceives thev outer part of the shifting'rod and is provided with an external screw thread whereby the saine is secured in an internally threaded opening in the adjacent pait of the base. Surrounding the inner part of the shifting rod and bearin@- at its opposite ends against the front side of the bracket and the rear end Q 1-l' ll'l" 34 w71'l oi the ous img is a ie ica .spring unici tends constantly to push the bracket, the feeding chamber, the normally fixed grinding disk and the parts moving therewith incan f and be forced forwardly or outwardly the vthe plates between the same become clogged by some hard material which they are unable to crush. lnits preferred form this quick releasing device ,comprises a rotatable cam i0 which turns about the axis of the shifting rod and bears at its o-uter endy against the inner side of the adjusting screw nut 36 while its inner side is provided with an incline or cam face el which engages with a correspondlng incline or camy face 42 on the outer end of the abutment bushing. j When the face of this releasingfcam is par allel wit-h the face of the abutment cam and these faces engage flatwise with each other, asshown in Figs. l and 2, the spring 34 is permitted to move the feeding chamber and the parts associated therewith into their innermost position which is'determined by the position of the head of the adjusting rod. if the space between the grinding disk becomes clogged and a quick separation ofr the same is necessary or'desirable to either prevent injury to the machine or enable the obstructionto clear itself from` the grinding Vplates this 'is accomplished by turning the releasing cam so that a wedging action of j this cam is produced relatively to the abutment bushing whereby the shifting rod is moved outwardly or forwardly together' with the feeding chamber7 normally fixed grinding heads and associated parts, thereby Y separating the grinding plates and releasing the obstructing material. A washer splined to the adjusting rod 3i is preferably mounted on the latter between the camv 40 and theiadjusting screw nut 36 by engaging a lug O'in the bore of this washer with alreyway 5l in the adjusting rod for preventing the rotationy of this cam from affecting this screw nut,y as shown in Figs. l 2 and 4. The releasing cam is operated by means of a handle projecting laterally therefrom, as shown in Figs. l and 2.

If duringthe ordinary operation of the machine any hard material should get in between the two pairsor sets of grinding plates which the latter are unable to crush,the normally fixed grinding head and feed chamber wouldy yield due to the resistance of such material f required extent, this being possible owing to the yielding resistance which is offered by the spring 34. By turning the adjusting y screw l6 in one direction or the other the space between the grinding plates may be regulated according tohow line it is desired to grind the material and this screw nut also permits of separating the grinding headsor disks a considerable distance in order to render the grinding plates conveniently acces sible for inspection, adjustment and repairs. This adjusting device therefore enables the grinding heads to separate automatically for the purpose of avoiding breakage in case unduly hard material enters the space between the grinding plates. These heads may also be quickly separated a considerable eX- tent for clearing their plates from unduly hard obstruction7 the heads may be readily adjusted to secure the desired degree of lineness in the grinding operation and the heads may also be widely separated for convenience in replacing worn grinding plates with new ones.

inasmuch as this adjusting device is arranged underneath the feeding chamber and principally within the hollow parts of the base a very compact construction is produced which is not only simple and capable of be- Y, ing produced at comparatively low cost but the same is also out of the way where it interferes least with the free movement of the attendant and it also produces a neat and sightly appearance of the'machine.

The grinding heads and the adjacent parts of the driving shaft and feeding chamber are inclosed by a casing awhich is removablymounted on the adjacent part of the frame and is open on its underside so as to discharge the material ground between the headsdownwardly to the underside ofthe Vmachine where the same maybe disposed of in any 'suitable manner.

I claim as my invention: f

l, A grinding machine comprising a frame, a feed chamber movably mounted on said frame and having an opening at its outer end, a cover detachably secured to the chamber over said opening, two relatively j movable grinding elements facing each other and one mounted on said frame and the other on said feed chamber and an adjusting device connecting the lower parts of said frame and the feed chamber.

A- grinding machine comprising a frame, a rotatable grinding head journaled on said frame, a normally fixed grinding disk facing said rotatable head, a feed chamber carrying said normally fixed head and adjustable on said frame toward and from said rotatable head and having an openingat its outer end, a cover detachablv secured to the chamber over said opening, and an adjusting device connecting the lower parts of said frameand the feed chamber.

3. `A grinding machine comprising a frame, a rotatable grindingy head journaled` on said `frame, a normally fixed grinding disk facing said rotatable head, a :feed chamber carrying said normally fixed head and slidable on said frame toward and from said rotatable head and having an opening at its outer end, a cover detachably secured to the chamber over said opening, and an adjusting device arranged between said frame and feed chamber on the lower parts thereof.

d. l grinding -iachine comprising a trame, a rotatable grinding head journaled on said frame, a normally fixed grinding disk facing said rotatable head, a feed chamber carrying said normally xed head and slidable on said frame toivard and from said rotatable headand having an opening at its outer end, a cover detachably secured to the chamber over said opening, and an adjusting device arranged betiveen said frame and feed chamber and comprising yielding means which operate to move said chamber and normally fixed head toivard. the rotatable head and positively operating means for withdrawing said chamber and normally fixed headk from said rotatable head.

5. A grinding machine comprising a trame, a rotatable grinding rhead ournaled on said frame, a normally fixed grinding disk facing said rotatable head and having an axial feed passage, a feed chamber carrying said normally lixed head and movable therewith on the frame toward and from said rotatable head and having an inlet on its top for the material to be ground and an outlet for the same in its inner end Which opens into the axial passage of said normally fixed head and having an opening at its outer en l, a cover detachably secured to the chamber oversaid opening, and an adjusting device connecting the lower parts of said frame and the'feed chamber.

G. ,ik grinding machine comprising trame, a rotatable grinding head journaled on said frame, a normally fixed grinding disk facing said rotatable head, a feed chamber carrying said normally fixed head and movable toivard and from said rotatable head and having an opening at its outer end,

Y a cover detachably secured to the chamber over said opening', and a sliding' connection between said chamber and frame comprising a dove-tail guidevvay arranged on the upper side of said frame and a dove-tail carriage sugporting said chamber and engaging With said dove-tail guideivay.

7, l grinding machine comprising a frame, a rotatable grinding head journaled on said frame, a normally xed grinding disk facing said rotatable head, a feed chamber carrying said normally fixed head and movable toivard and from said rotatable head n and having an opening at its outer end, a

igea-'gaas cover detachably secured to the chamber over said opening, and means for adjusting said chamber on said frame arranged between the underside of said chamber and the adjacent part of said frame.

S. A grinding machine comprising `a frame, a rotatable grinding head journaled on said frame, a normally fixed grinding disk facing said rotatable head, a feed cham` ber carrying said normally fixed head and movable toivard and from said rotatable head and having an opening at its outer end, a cover detachably secured to the chamber over said opening, and means for adjustably connecting said chamber and. frame comprising a bracket depending from the underside of said chamber, a shifting rod mounted on said bracket and slidable in said frame and provided With a screw thread, a spring interposed between said `frame and bracket and operating to move said chamber and the parts mounted thereon toivard said rotatable head, and an adjusting screw nut arranged on the threaded part of said rod and abutting against a part on the outer side of said frame.

9. A grinding machine comprising a frame', a rotatable grinding head journaled on said frame, a normally fixed grinding disk facing said rotatable head, a feed chamber carrying said normally fixed head and moifable ton-*ard and from said rotatable head and lhaving an opening at its out-er end, a cover detachably secured' to the chamber over said opening, and means for adjustably connecting said chamber and frame comprising a bracket depending from ae underside of said chamber, a shifting d mounted on said bracket and slidable said frame and provided VWith a screw thread, a spring interposed between said frame and bracket and operating to move said chamber and the parts mounted therero in p on toward said rotatable head, an adjusting screw nut arranged on the threaded partot' rod, and a cam rotatable between said screw nut and a part on the outer side f said frame.

l0, A grinding machine comprising a frame, a rotatable grinding head journaled on said frame, a normally fixed grinding disk facing said rotatable head, a feed chamber carrying said normally fixed head and movable toivard and from said rotatable head and having an opening at its outer end, a cover detachably secured to the chamber over said opening, and means for adjustably connecting said chamber Vand frame comprising a bracket depending from the underside of said chamber, a shifting rod mounted on said bracket and slidable in said frame and provided with a screw thread, a spring' interposed between said frame and bracket and operating to move :said chamber and the parte mounted thereon toward said rotatable head, an adjusting screw nut arranged on the threaded part of said rod, a Clamping screw nut arranged on he threaded portion of said rod and engaging With the outer side of said adjusting screw nut, a bushing surrounding said rod and secured to said frame and having a camehaped outer face, a cam mounted on the inner side of said adjusting screw and rotatable about the axis thereof and provided on its inner side With a cam face which engages with the cam face of said bushing and a Washer splned on said rod and arranged between said cam and adjusting screw nut.

LEO F. MGNALLY.

Copies of this patent may be obtained for :five cents each, by addressingV the Commissioner of Patents. Washington, D. C. 

